Oct 2, 2012 10:00pm PDT
largest coral system is in decline. researchers at the australian institute of marine science say the reef has lost half of its coral cover over the past 27 years. there are multiple causes, including a destructive kind of starfish shown here. we look at what's behind it and what's at stake-- in australia and around the world-- with nancy knowlton, a coral reef biologist and a chair of marine science at the smithsonian national museum of natural history here in washington. welcome. >> thanks. how has all of this coral died off? do we know what's causing it? is it all that... >> it's not all the star fish. the star fish is about 42%. typhoons, big strong storms another 48% and then coral bleaching is the remaining 10% which is caused whenever the water gets too hot. >> ifill: so this is human causedded? >> yes. most of it is human caused. i mean a coral reef naturally goes through cycles of up and down. but it shouldn't be declining by half over course of 27 years. >> ifill: i feel like we have talked before about the declining coral cover. but not... but i'm wondering whether it's now
Sep 25, 2012 5:30pm PDT
years of mathematics, at least three years of science and at least three years of social science, comparedded to those who students who did not complete a core curriculum, those students completing a core curriculum scored 144 points higher on the s.a.t. >> suarez: what do we know about the predictive value of the test itself? you have a threshold for college readiness. if you go into an institution of higher learning without reaching that threshold, are you automatically going to fail, not complete? what do we know? >> absolutely not. that threshold is a guide. it allows us to look at groups of students. what we know is that the group of students who meet the threshold have a 65% likelihood of achieving a b-minus g.p.a. or higher during their freshman year. obviously there are other factors that admission officers take into consideration. but it does help guide us in thinking about where we are and the need to have more students better prepared for college. currently of 100 ninth graders, 44 will go on to college. yet only 21 will graduate within a six-year period. this is highl
Sep 27, 2012 3:00pm PDT
alfred p. sloan foundation. supporting science, technology, and improved economic performance and financial literacy in the 21st century. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> woodruff: israel's prime minister warned again today that iran is well on its way to creating a nuclear weapon and said the world needs to act. benjamin netanyahu spoke at the united nations. as he has often before, netanyahu condemned iran and its nuclear program, and called on other leaders to do the same. >> at stake is not merely the future of my country. at stake is the future of the world. and nothing could imperil our common future more than the arming of iran with nuclear weapons. >> woodruff: the israeli prime minister said the hour is, quote, "getting late" to stop iran as it continues its nuclear work. >> i speak about it now because the iranian nuclear calendar doesn't take time out for anyone or for anything.
Oct 3, 2012 6:00pm EDT
results in just two days. the research was published in the journal, "science translational medicine." the paper reported the tests of just six newborns in neonatal units, but the implications could be widespread. roughly 20% of infant deaths in the u.s. are caused by inherited genetic conditions, according to the study. doctor stephen kingsmore led the research team at children's mercy hospitals in kansas city. he's the director for the center for pediatric genomic medicine there. dr. kingsmore, welcome, and thank you for being with us. first of all,-- >> thank you very much. >> warner: how big a breakthrough is this? >> this is a big breakthrough. we've been working toward this goal for a coup of years now. there has been a big gap between the knowledge that we have of genetic diseases, about 35% of them, and the ability for doctors to identify which of these was a problem in any given child with an illness. >> warner: and up until now, how much have you been able to diagnose the d.n.a. abnormalities? how quickly? i mean, i said it can take weeks and weeks, but what's the process that's